You can use `exec` for that:

    &gt;&gt;&gt; foo = &quot;bar&quot;
    &gt;&gt;&gt; exec(foo + &quot; = &#39;something else&#39;&quot;)
    &gt;&gt;&gt; print bar
    something else
    &gt;&gt;&gt; 



You will be much happier using a dictionary instead:

    my_data = {}
    foo = &quot;hello&quot;
    my_data[foo] = &quot;goodbye&quot;
    assert my_data[&quot;hello&quot;] == &quot;goodbye&quot;



You can use `setattr`

    name  = &#39;varname&#39;
    value = &#39;something&#39;
    
    setattr(self, name, value) #equivalent to: self.varname= &#39;something&#39;
    
    print (self.varname)
    #will print &#39;something&#39;

But, since you should inform an object to receive the new variable, this only works inside classes or modules.

In **[Sublime Text 2](https://www.sublimetext.com/2)**, how do I enclose a selection in a **comment**?  
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What&#39;s the difference between these two?

I noticed that if I changed from `socket.emit` to `socket.send` in a working program, the server failed to receive the message, although I don&#39;t understand why.

I also noticed that in my program if I changed from `socket.emit` to `socket.send`, the server receives a message, but it seems to receive it multiple times. When I use `console.log()` to see what the server received, it shows something different from when I use `socket.emit`.

Why this behavior? How do you know when to use `socket.emit` or `socket.send`?

socket.emit() vs. socket.send()

&gt; **Possible Duplicate:**  
&gt; [How do I do variable variables in Python?](https://stackoverflow.com/questions/1373164/how-do-i-do-variable-variables-in-python)  

&lt;!-- End of automatically inserted text --&gt;

I have a variable with a string assigned to it and I want to define a new variable based on that string. 

    foo = &quot;bar&quot;
    foo = &quot;something else&quot;   
    
    # What I actually want is:
    
    bar = &quot;something else&quot;



Using a string variable as a variable name

> Possible Duplicate: 
> <a href="https://stackoverflow.com/questions/1373164/how-do-i-do-variable-variables-in-python" target="_blank" rel="noopener noreferrer">How do I do variable variables in Python?</a>

I have a variable with a string assigned to it and I want to define a new variable based on that string.
<pre><code class="hljs language-ini">foo = "bar"
foo = "something else" 

# What I actually want is:

bar = "something else"
</code></pre>

In pre-historic times (Python 1.4) we did:

    fp = open(&#39;filename.txt&#39;)
    while 1:
        line = fp.readline()
        if not line:
            break
        print line

after Python 2.1, we did:

    for line in open(&#39;filename.txt&#39;).xreadlines():
        print line

before we got the convenient iterator protocol in Python 2.3, and could do:

    for line in open(&#39;filename.txt&#39;):
        print line

I&#39;ve seen some examples using the more verbose:

    with open(&#39;filename.txt&#39;) as fp:
        for line in fp:
            print line

is this the preferred method going forwards?

[edit] I get that the with statement ensures closing of the file... but why isn&#39;t that included in the iterator protocol for file objects?

How should I read a file line-by-line in Python?

I have the code below in my Python script:

    def cmd_wui(argv, path_to_tx):
        &quot;&quot;&quot;Run a web UI.&quot;&quot;&quot;
        from flask import Flask, flash, jsonify, render_template, request
        import webbrowser
        app = Flask(__name__)
        
    
        @app.route(&#39;/tx/index/&#39;)
        def index():
            &quot;&quot;&quot;Load start page where you select your project folder
            or load history projects from local DB.&quot;&quot;&quot;
            from txclib import get_version
            txc_version = get_version()
            prj = project.Project(path_to_tx)
    
            # Let&#39;s create a resource list from our config file
            res_list = []
            prev_proj = &#39;&#39;
            for idx, res in enumerate(prj.get_resource_list()):
                    hostname = prj.get_resource_host(res)
            username, password = prj.getset_host_credentials(hostname)
            return render_template(&#39;init.html&#39;, txc_version=txc_version, username=username)
    

Also, I have an HTML form in init.html:

    &lt;form&gt;
    &lt;input type=&quot;text&quot; id=&quot;projectFilepath&quot; size=&quot;40&quot; placeholder=&quot;Spot your project files&quot;&gt;
    &lt;input type=&quot;button&quot; id=&quot;spotButton&quot; value=&quot;Spot&quot;&gt;
    &lt;/form&gt;

How can I pass the user input from &quot;projectFilepath&quot; when a user clicks &quot;spotButton&quot; on a variable in my python script?

I&#39;m new in Python and Flask, so forgive me if I make any mistakes.

Sending data from HTML form to a Python script in Flask

In Python say you have

    s = &quot;string&quot;
    i = 0
    print s + i

will give you error, so you write

    print s + str(i)

to not get error.

I think this is quite a clumsy way to handle int and string concatenation.

Even Java does not need explicit casting to String to do this sort of concatenation.
Is there a better way to do this sort of concatenation, i.e, without explicit casting in Python?




Concatenating string and integer in Python

I would like to implement an `Iterator` in Java that behaves somewhat like the following generator function in Python:

    def iterator(array):
       for x in array:
          if x!= None:
            for y in x:
              if y!= None:
                for z in y:
                  if z!= None:
                    yield z

x on the java side can be multi-dimensional array or some form of nested collection. I am not sure how this would work. Ideas?

Generator functions equivalent in Java

I have the following code which easily connects to the FTP server and opens a zip file. I want to download that file into the local system. How to do that?

    # Open the file for writing in binary mode
    print &#39;Opening local file &#39; + filename
    file = open(filename, &#39;wb&#39;)
    
    # Download the file a chunk at a time
    # Each chunk is sent to handleDownload
    # We append the chunk to the file and then print a &#39;.&#39; for progress
    # RETR is an FTP command
    
    print &#39;Getting &#39; + filename
    ftp.retrbinary(&#39;RETR &#39; + filename, handleDownload)
    
    # Clean up time
    print &#39;Closing file &#39; + filename
    file.close()

Content Type	Original Author	Original Content on Stackoverflow
Question	9-bits	View Question on Stackoverflow
Solution 1 - Python	Jack Leow	View Answer on Stackoverflow
Solution 2 - Python	Ned Batchelder	View Answer on Stackoverflow
Solution 3 - Python	Gustavo Vargas	View Answer on Stackoverflow

Using a string variable as a variable name

Python Problem Overview

Python Solutions

Solution 1 - Python

Solution 2 - Python

Solution 3 - Python

socket.emit() vs. socket.send()

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